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X射线脉冲星动态信号处理方法研究
张大鹏1,2, 李治泽1, 王奕迪1, 郑伟1
1.国防科技大学 空天科学学院, 长沙 410073;2.中国西安卫星测控中心, 西安 710043
摘要:
X射线脉冲星导航是一种基于X射线脉冲星观测的新型天文自主导航方法，脉冲星在轨动态信号处理技术一直是脉冲星导航的难点和重点，特别是低轨高动态条件下的信号处理比高轨低动态情况更加困难。针对动态信号处理中实测数据信噪比偏低的问题，提出了一种适用于低轨高动态情况的脉冲星动态信号处理方法，并对其原理进行了分析，建立了相关数学模型，并使用HXMT卫星和XPNAV-1卫星的实测数据验证了算法性能，实验结果表明：该方法有效提高了导航观测量处理精度。
关键词:  X射线脉冲星导航  HXMT  XPNAV-1  动态信号处理
DOI：10.15982/j.issn.2095-7777.2019.04.004
分类号:
基金项目:国家自然科学基金资助项目（0901010517001）
Dynamic Data Processing for X-Ray Pulsar Signal
ZHANG Dapeng1,2, LI Zhize1, WANG Yidi1, ZHENG Wei1
1.College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China;2.Xi'an Satellite Control Center, Xi'an 710043, China
Abstract:
X-ray pulsar-based navigation is a novel astronomical autonomous navigation method based on X-ray pulsar observation., The dynamic data processing is one of the key technologies for X-ray Pulsar-based navigation. Especially data processing under the condition of low-orbit and high-dynamic is more difficult than that under the conditions of high-orbit and lowdynamic. Aiming at the measured data with low signal-to-noise ratio,a target function re-estimation method is proposed for the condition of low-orbit and high-dynamic. Furthermore, the principle of the method is analyzed and the mathematical model is constructed. The performance of the method is verified by the measured data from HXMT and XPNAV-1 satellites.
Key words:  X-ray pulsar-based navigation  HXMT  XPNAV-1  dynamic signal processing